From the files of Project Blue Book, this July 19, 1949 UFO incident seems to have been a pretty straightforward airplane that was misidentified.
For more incidents around the world, visit the following links.
UFO Database
Mutual UFO Network
National UFO Reporting Center
From the files of Project Blue Book. The 1961 Ohio Stadium UFO incident occurred during an Ohio State home football game and could be viewed from the stadium itself. The object obviously had multiple witnesses, whose accounts are in the pages below. The object was thought to be a balloon, but was never positively identified.
For more incidents around the world, visit the following links.
UFO Database
Mutual UFO Network
National UFO Reporting Center